Mercedes-AMG’s CLA45 compact sedan may only work the door at Affalterbach’s internal-combustion madhouse. But with a transverse inline-four engine producing a bonkers 188 horsepower per liter, it makes for one helluva greeter. A host of recent updates have made the CLA45 4Matic—already a serious performer when it debuted for 2014—even stouter for 2017, albeit without much addressing of its underlying issues. READ MORE ››